Detailed Instructions: In this task, you're given a context passage, followed by a question that needs to be answered. Based on the paragraph, you must write unambiguous answers to the questions and your answer must refer to a specific phrase from the paragraph. If multiple answers seem to exist, write the answer that is the most plausible.
Q: I noticed that my alarm clock was not working. The numbers were not showing up on the screen. So I knew it was time to change the batteries. First, I checked to see what kind of batteries it used. It uses one 9 volt battery. Next, I checked to see if I had any 9 volt batteries in the house. I did not, so I knew I had to go to the store. I walked to the store and bought a pack of 9 volt batteries, and returned home. Then, I went to the alarm clock and opened the battery compartment. I took out the old battery and threw it away. Then I took a new battery out of the pack I just bought. I put it in the battery compartment and closed the compartment. Then I checked to see if the numbers were lit up. Then it was time to set the time. I checked my watch for the correct time and pushed the buttons to make the alarm clock the right time. Finally, I set the alarm time to the time I usually wake up and set the alarm for the next day. 
Question: How did they put the new batteries in?
A:
By opening the battery compartment and removing old battery